Air pump



FIG. 1 is a perspective view of an air pump showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a back elevation view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines depict portions of the article that form no part of the claimed design.

The dash-dot lines serve as boundaries between claimed portions of the design and unclaimed portions of the design. 

CLAIM The ornamental design for an air pump, as shown and described. 